"Just bag the patient" Hoo boy!! I love adminstrative ignorance. It is actually not that difficult to cause the patient an awful lot of problems if you do NOT bag them correctly. You certainly need to be shown how to bag a 12 year old child - too easy to do the wrong thing!!!
I have seen a tension pnuemothorax (this was many, many moons ago) on a young 16 year old that had been bagged during transport - the only reason that it did not kill the kid outright is that he did have a fit cardiovascular system.

shame on those who diminish nursing responsiblities - you did EXACTLY the right thing!!